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True [87]
3 years ago
7

How many moles are there in 25 g of water?

Chemistry
2 answers:
nordsb [41]3 years ago
8 0
1.39 moles in 25 grams of water
Misha Larkins [42]3 years ago
3 0
1 mole<span> H2O = 18.0 g H2O.</span>
<span>25 g H2O </span>1 mol<span> H2O.</span>
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What is the nuclear binding energy of an atom that has a mass defect of 5.0446
notsponge [240]

Answer:

<em>Option C: 4.54 x </em>10^{11}<em> KJ/mol of nuclei</em>

<em>Note: </em>Here in this question option C is not correctly put. It is 4.54 x10^{11} rather than 4.54 x 10^{-123}.

Explanation:

If mass defect is known, then nuclear binding energy can easily be calculated, here's how:

First step is to convert that mass defect into kg.

Mass defect = 5.0446 amu

Mass defect = 5.0466 x 1.6606 x 10^{-27}

Because 1 amu = 1.6606 x 10^{-27} Kg.

<em>Mass defect = 8.383 x </em>10^{-27}<em> kg.</em>

Now, we need to find out it's energy equivalent by using following equation:

Using the equation E = mc²:

where c= 3.00 x 10^{8} m/s²

E = (8.383 x 10^{-27}) x (3.00 x 10^{8})²

E = 7.54 x 10^{-10} J  this energy is in Joules but nuclear binding energy is usually expressed in KJ/mol of nuclei. Let's convert it:

(7.54 x 10^{-10} Joule/nucleus)x(1 kJ/1000 Joule)x(6.022 x 10^{23} nuclei/mol) =  

<em>4.54 x </em>10^{11}<em> kJ/mol of nuclei .</em>

E = <em>4.54 x </em>10^{11}<em> kJ/mol of nuclei .</em> So, this is the nuclear binding energy of that atom, which is option  C.

<em>Note:</em> Here in this question option C is not correctly put. It is 4.54 x10^{11} rather than 4.54 x 10^{-123}

4 0
3 years ago
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What do the subscripts in the formula for ethane represent?
Sedaia [141]

Answer:

the number of carbon and hydrogen atoms present in the molecule of Ethane that is it contains two carbon atoms and six hydrogen atoms

Explanation:

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2 years ago
Pls help me with this
liubo4ka [24]

Answer:

silver

5/20

=0.25.................

6 0
1 year ago
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Are atoms the smallest particles we know about, or are there smaller ones?
ZanzabumX [31]

Answer:

subatomic particles are smaller then atoms

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Help! Which of these is a compound?:<br>Carbon, chlorine, uranium, ammonia.
MrRa [10]
Ammonia is the compound.
4 0
3 years ago
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